Lewis will instead become a free agent but needs a procedure on his right knee. In his place, the Mavericks signed Al-Farouq Aminu to a reported two-year contract at the veteran minimum, with a player option for the second year.

"It came to our attention during Rashard Lewis's physical that he is in need of a medical procedure on his right knee," president of basketball operations Donnie Nelson said in a statement released by the Mavericks. “We wish him all the best for a speedy recovery and continued success in his remarkable career."

Lewis spent the past two seasons with the Miami Heat and was a member of their 2013 NBA championship team. Last season, he averaged 4.5 points, 1.8 rebounds and 16.2 minutes in 60 games. In the playoffs, he averaged 5.3 points and 2.1 rebounds.